Fully grown xenopus oocytes can remain in their immature state essentially indefinitely , or , in response to the steroid hormone progesterone , can be induced to develop into fertilizable eggs . this process is termed oocyte maturation 介绍：爪蟾卵在成熟过程中可以无限期的停留在未成熟状态，直到在激素的刺激下，成为可受精的卵细胞，这个过程称为卵成熟。
